[deliverable/linux.git] / drivers / usb / otg / nop-usb-xceiv.c

/*
 * drivers/usb/otg/nop-usb-xceiv.c
 *
 * NOP USB transceiver for all USB transceiver which are either built-in
 * into USB IP or which are mostly autonomous.
 *
 * Copyright (C) 2009 Texas Instruments Inc
 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Current status:
 *	This provides a "nop" transceiver for PHYs which are
 *	autonomous such as isp1504, isp1707, etc.
 */

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/otg.h>
#include <linux/slab.h>

struct nop_usb_xceiv {
	struct usb_phy		phy;
	struct device		*dev;
};

static struct platform_device *pd;

void usb_nop_xceiv_register(void)
{
	if (pd)
		return;
	pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
	if (!pd) {
		printk(KERN_ERR "Unable to register usb nop transceiver\n");
		return;
	}
}
EXPORT_SYMBOL(usb_nop_xceiv_register);

void usb_nop_xceiv_unregister(void)
{
	platform_device_unregister(pd);
	pd = NULL;
}
EXPORT_SYMBOL(usb_nop_xceiv_unregister);

static int nop_set_suspend(struct usb_phy *x, int suspend)
{
	return 0;
}

static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
{
	if (!otg)
		return -ENODEV;

	if (!gadget) {
		otg->gadget = NULL;
		return -ENODEV;
	}

	otg->gadget = gadget;
	otg->phy->state = OTG_STATE_B_IDLE;
	return 0;
}

static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
{
	if (!otg)
		return -ENODEV;

	if (!host) {
		otg->host = NULL;
		return -ENODEV;
	}

	otg->host = host;
	return 0;
}

static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev)
{
	struct nop_usb_xceiv	*nop;
	int err;

	nop = kzalloc(sizeof *nop, GFP_KERNEL);
	if (!nop)
		return -ENOMEM;

	nop->phy.otg = kzalloc(sizeof *nop->phy.otg, GFP_KERNEL);
	if (!nop->phy.otg) {
		kfree(nop);
		return -ENOMEM;
	}

	nop->dev		= &pdev->dev;
	nop->phy.dev		= nop->dev;
	nop->phy.label		= "nop-xceiv";
	nop->phy.set_suspend	= nop_set_suspend;
	nop->phy.state		= OTG_STATE_UNDEFINED;

	nop->phy.otg->phy		= &nop->phy;
	nop->phy.otg->set_host		= nop_set_host;
	nop->phy.otg->set_peripheral	= nop_set_peripheral;

	err = usb_add_phy(&nop->phy, USB_PHY_TYPE_USB2);
	if (err) {
		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
			err);
		goto exit;
	}

	platform_set_drvdata(pdev, nop);

	ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);

	return 0;
exit:
	kfree(nop->phy.otg);
	kfree(nop);
	return err;
}

static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev)
{
	struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);

	usb_remove_phy(&nop->phy);

	platform_set_drvdata(pdev, NULL);
	kfree(nop->phy.otg);
	kfree(nop);

	return 0;
}

static struct platform_driver nop_usb_xceiv_driver = {
	.probe		= nop_usb_xceiv_probe,
	.remove		= __devexit_p(nop_usb_xceiv_remove),
	.driver		= {
		.name	= "nop_usb_xceiv",
		.owner	= THIS_MODULE,
	},
};

static int __init nop_usb_xceiv_init(void)
{
	return platform_driver_register(&nop_usb_xceiv_driver);
}
subsys_initcall(nop_usb_xceiv_init);

static void __exit nop_usb_xceiv_exit(void)
{
	platform_driver_unregister(&nop_usb_xceiv_driver);
}
module_exit(nop_usb_xceiv_exit);

MODULE_ALIAS("platform:nop_usb_xceiv");
MODULE_AUTHOR("Texas Instruments Inc");
MODULE_DESCRIPTION("NOP USB Transceiver driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
f6d92a05 AKG	1	/*
	2	* drivers/usb/otg/nop-usb-xceiv.c
	3	*
	4	* NOP USB transceiver for all USB transceiver which are either built-in
	5	* into USB IP or which are mostly autonomous.
	6	*
	7	* Copyright (C) 2009 Texas Instruments Inc
	8	* Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	23	*
	24	* Current status:
cc835e32 DB	25	* This provides a "nop" transceiver for PHYs which are
cc835e32 DB	26	* autonomous such as isp1504, isp1707, etc.
f6d92a05 AKG	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/platform_device.h>
	31	#include <linux/dma-mapping.h>
	32	#include <linux/usb/otg.h>
5a0e3ad6	33	#include <linux/slab.h>
f6d92a05 AKG	34
f6d92a05 AKG	35	struct nop_usb_xceiv {
41adf109	36	struct usb_phy phy;
f6d92a05 AKG	37	struct device *dev;
	38	};
	39
cc835e32	40	static struct platform_device *pd;
f6d92a05 AKG	41
	42	void usb_nop_xceiv_register(void)
	43	{
cc835e32 DB	44	if (pd)
	45	return;
	46	pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
	47	if (!pd) {
f6d92a05 AKG	48	printk(KERN_ERR "Unable to register usb nop transceiver\n");
	49	return;
	50	}
	51	}
cc835e32	52	EXPORT_SYMBOL(usb_nop_xceiv_register);
f6d92a05 AKG	53
	54	void usb_nop_xceiv_unregister(void)
	55	{
cc835e32	56	platform_device_unregister(pd);
dc7520c1	57	pd = NULL;
f6d92a05	58	}
cc835e32	59	EXPORT_SYMBOL(usb_nop_xceiv_unregister);
f6d92a05	60
86753811	61	static int nop_set_suspend(struct usb_phy *x, int suspend)
f6d92a05 AKG	62	{
	63	return 0;
	64	}
	65
41adf109	66	static int nop_set_peripheral(struct usb_otg otg, struct usb_gadget gadget)
f6d92a05	67	{
41adf109	68	if (!otg)
f6d92a05 AKG	69	return -ENODEV;
f6d92a05 AKG	70
f6d92a05	71	if (!gadget) {
41adf109	72	otg->gadget = NULL;
f6d92a05 AKG	73	return -ENODEV;
	74	}
	75
41adf109 HK	76	otg->gadget = gadget;
41adf109 HK	77	otg->phy->state = OTG_STATE_B_IDLE;
f6d92a05 AKG	78	return 0;
	79	}
	80
41adf109	81	static int nop_set_host(struct usb_otg otg, struct usb_bus host)
f6d92a05	82	{
41adf109	83	if (!otg)
f6d92a05 AKG	84	return -ENODEV;
f6d92a05 AKG	85
f6d92a05	86	if (!host) {
41adf109	87	otg->host = NULL;
f6d92a05 AKG	88	return -ENODEV;
	89	}
	90
41adf109	91	otg->host = host;
f6d92a05 AKG	92	return 0;
	93	}
	94
	95	static int __devinit nop_usb_xceiv_probe(struct platform_device *pdev)
	96	{
	97	struct nop_usb_xceiv *nop;
	98	int err;
	99
	100	nop = kzalloc(sizeof *nop, GFP_KERNEL);
	101	if (!nop)
	102	return -ENOMEM;
	103
41adf109 HK	104	nop->phy.otg = kzalloc(sizeof *nop->phy.otg, GFP_KERNEL);
	105	if (!nop->phy.otg) {
	106	kfree(nop);
	107	return -ENOMEM;
	108	}
	109
f6d92a05	110	nop->dev = &pdev->dev;
41adf109 HK	111	nop->phy.dev = nop->dev;
	112	nop->phy.label = "nop-xceiv";
	113	nop->phy.set_suspend = nop_set_suspend;
	114	nop->phy.state = OTG_STATE_UNDEFINED;
	115
	116	nop->phy.otg->phy = &nop->phy;
	117	nop->phy.otg->set_host = nop_set_host;
	118	nop->phy.otg->set_peripheral = nop_set_peripheral;
	119
662dca54	120	err = usb_add_phy(&nop->phy, USB_PHY_TYPE_USB2);
f6d92a05 AKG	121	if (err) {
	122	dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
	123	err);
	124	goto exit;
	125	}
	126
	127	platform_set_drvdata(pdev, nop);
	128
41adf109	129	ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
20831ad2	130
f6d92a05 AKG	131	return 0;
f6d92a05 AKG	132	exit:
41adf109	133	kfree(nop->phy.otg);
f6d92a05 AKG	134	kfree(nop);
	135	return err;
	136	}
	137
	138	static int __devexit nop_usb_xceiv_remove(struct platform_device *pdev)
	139	{
	140	struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
	141
662dca54	142	usb_remove_phy(&nop->phy);
f6d92a05 AKG	143
f6d92a05 AKG	144	platform_set_drvdata(pdev, NULL);
41adf109	145	kfree(nop->phy.otg);
f6d92a05 AKG	146	kfree(nop);
	147
	148	return 0;
	149	}
	150
	151	static struct platform_driver nop_usb_xceiv_driver = {
	152	.probe = nop_usb_xceiv_probe,
	153	.remove = __devexit_p(nop_usb_xceiv_remove),
	154	.driver = {
	155	.name = "nop_usb_xceiv",
	156	.owner = THIS_MODULE,
	157	},
	158	};
	159
	160	static int __init nop_usb_xceiv_init(void)
	161	{
	162	return platform_driver_register(&nop_usb_xceiv_driver);
	163	}
	164	subsys_initcall(nop_usb_xceiv_init);
	165
	166	static void __exit nop_usb_xceiv_exit(void)
	167	{
	168	platform_driver_unregister(&nop_usb_xceiv_driver);
	169	}
	170	module_exit(nop_usb_xceiv_exit);
	171
	172	MODULE_ALIAS("platform:nop_usb_xceiv");
	173	MODULE_AUTHOR("Texas Instruments Inc");
	174	MODULE_DESCRIPTION("NOP USB Transceiver driver");
	175	MODULE_LICENSE("GPL");